656139239 has 32 divisors (see below), whose sum is σ = 819072000. Its totient is φ = 513241344.

The previous prime is 656139229. The next prime is 656139251. The reversal of 656139239 is 932931656.

It is not a de Polignac number, because 656139239 - 2²⁰ = 655090663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 656139239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656139229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 414752 + ... + 416330.

It is an arithmetic number, because the mean of its divisors is an integer number (25596000).

Almost surely, 2^656139239 is an apocalyptic number.

656139239 is a deficient number, since it is larger than the sum of its proper divisors (162932761).

656139239 is a wasteful number, since it uses less digits than its factorization.

656139239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727.

The product of its digits is 262440, while the sum is 44.

The square root of 656139239 is about 25615.2149903139. The cubic root of 656139239 is about 868.9577685423.

The spelling of 656139239 in words is "six hundred fifty-six million, one hundred thirty-nine thousand, two hundred thirty-nine".